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Capstone · Grades 7–9 Keystones #144 24 May 2026
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Keystones — Capstone

Five GCSE retrieval questions · 24 May 2026 · mathsvault.uk/keystones

  1. 1. Number

    The sum of three consecutive numbers is 90. What are the numbers?

    Answer: 29, 30, and 31
  2. 2. Algebra

    Solve: x⁄2 = 19

    Answer: x = 38
  3. 3. Geometry

    A right triangle has hypotenuse 10cm and one side 6cm. Find its area

    Answer: 24cm²
  4. 4. Ratio

    Simplify the ratio 7m:700cm

    Answer: 1:100
  5. 5. Statistics

    The mean of 6 numbers is 25. If 5 of them are 31, 16, 15, 19, 15, what is the missing number?

    Answer: 54

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